Stereoselective Synthesis of Protected Ketohexoses via Aldol Reaction of Chiral Dioxanone Enolate

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Abstract
Lithium and boron enolates of 2,2-dialkyl-1,3-dioxa-5-ones react with aldehydes to give aldol products in high diastereoselectivity and, when chiral lithium enolates are generated using optically pure chiral lithium amide bases, in high enantioselectivity. Dioxanone lithium enolates react readily with protected glyceraldehyde affording protected ketohexoses in high diastereo- and enantiomeric purity.

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